Hormones are chemically diverse substances (e.g. steroids;
peptides), which are released into the bloodstream in response to some
stimulus, and activate cells, depending on the hormone in question.
The system of a group of glands and organs in the body that controls the
secretion of hormones into the blood stream is called the endocrine
system .
The main components of the endocrine system, the main hormones they secrete
and their function are laid out in the table below.
The hormonal disorders dealt with in this section are:

The information in this page is presented in summarised form and has been taken
from the following source(s):
1.
University of Maryland Medical System Online Health Guides:
http://www.umm.edu/ 2.
Introduction to Human Physiology , 2nd Edition (1981), M. Griffins, Macmillan Publishing
Co. Inc, New York